Biggest Celebrity Weight Loss Stories In Pictures

Jennifer Hudson's fantastic makeover in 2010 had everyone buzzing. She embarked on her weight loss journey the year before after giving birth to her son and to get in shape to play Nelson Mandela's wife, Winnie.

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Jen became spokesperson for Weight Watchers and also had the help of celebrity trainer Harley Pasternak. She went from a size 16 to a size 6.

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Jonah Hill's shocking weight loss in 2011 stuned Hollywood who were so used to seeing the chubbier version of himself.

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Although Jonah has put back on some of the weight his drastic weight loss was incredible. He credited eating Japanese food and said it was mostly his diet change that helped him.

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Ricki Lake's weight was a big part of her breakout role in Hairpray 25 years ago.

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Over the years Ricki has yo-yo'd including back in 1992 when she lost 100lbs by basically "starving" herself. But the mom-of-two later shed 140lbs and maintains her sexy size 6 figure by enjoying meals from a fresh-food delivery service and working out.

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Perez Hilton had the slowly but surely approach to his weight loss—dropping 60lbs over a three year period.

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The celebrity blogger, and new dad, started doing just 30 minute walks a day which eventually turned into daily workout sessions and uses a meal delivery service.

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Kelly Osbourne won the hearts of America when she appeared on Dancing With The Stars and has been open about how comfort eating led to her yo-yo weight over the years.

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The Fashion Police co-host got down to a size 2 by continuing her training after DWTS was over which had given her the kickstart she needed.

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Drew Carey lost 80lbs after embarking on his weight loss journey in 2010 and is now medication free for his type 2 diabetes.

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The Price Is Right host dropped the pounds by staying away from carbs and sticking to just fruit, vegetables and lots of protein as well as working out six times a week.

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Kirstie Alley has not had an easy time of it in the press regarding her weight. She lost 75lbs with Jenny Craig but eventually put it all back on.

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Kirstie's time on Dancing With The Stars helped to get her fit and she was looking better than ever thanks to the daily workouts prepping for the show.

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Jessica Simpson was under a lot of pressure to lose her post-baby weight and has yo-yo'd since her days in her daisy dukes.

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The Fashion Star mentor dropped 60lbs and became a spokesperson for Weight Watchers. She's now pregnant with her second child.

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Janet Jackson has battled with her weight for years and is quite the yo-yo dieter.

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The Control singer got skinny after trying out the Nutrisystem eating program which obviously worked for her although she says she doesn't know how much she lost because she stays away from the scale.

Once celebrities set their mind to dropping the lbs, they do it in spectacular style, making for some amazing before and after pictures. Check out the images of the stars at their heaviest and how they managed to win the battle of the bulge.